Gates take a lot of abuse — constant movement, weather exposure, occasional vehicle impacts, and years of load cycling on the hinges. Most gate failures are structural and repairable. Here are the five problems we fix most often in Sydney, and what the repair actually involves.
The 5 Most Common Gate Problems Fixed by Welding
1. Separated or Cracked Hinge Plates
The most common gate failure. The hinge plate — the flat steel plate welded to the gate frame and the post — separates from the weld, either at the gate or at the post. The gate starts sagging, scraping along the ground, or won't stay in position.
The repair: grind back the failed weld, re-bevel if needed, re-weld the hinge plate back in position. If the plate has cracked (not just the weld), we cut out the damaged section and weld in a new plate. For heavy gates (80kg+), we often upgrade from flat plate to a heavier-gauge gusset-reinforced connection.
Most hinge plate repairs take 45–90 minutes on-site. The gate doesn't need to come off its hinges in most cases.
2. Cracked Frame Corners and Joints
Gate frames are typically rectangular RHS (rectangular hollow section) tubing with mitred or butt-welded corners. Corners crack at the weld, or the tube wall develops fatigue cracks from constant load cycling. You'll see this most on heavier driveway gates or gates where the frame has twisted over time.
The repair: clean back the crack, assess whether it's a weld failure or a base-metal fatigue crack (different repair approaches), then re-weld. If the tube wall has cracked rather than the weld, we sometimes add a reinforcing plate over the damaged section rather than cutting the tube out entirely.
3. Rust-Through on Horizontal Members
Horizontal tubes collect water inside if the end caps fail or were never sealed. Sydney's humidity accelerates internal corrosion, and eventually the bottom of the tube rusts through from the inside out. You see a hole appearing in the bottom face of a horizontal rail.
The repair depends on the extent of rust damage. Localised rust-through (single hole, good surrounding metal): cut out the rusted section, weld in a patch plate. Extensive corrosion (multiple holes, soft metal across a significant length): cut out and replace the full section with new tube. After repair, we seal the ends to prevent recurrence.
4. Bent Sections from Vehicle Impact
A common cause in driveways — someone clips the gate with a vehicle and bends a vertical member, a horizontal rail, or the hinge post. The damage is localised but the gate either won't close or won't open cleanly.
Straightening bent steel in-situ is sometimes possible for minor deformation. For significant bends, the cleaner option is cutting out the damaged section and welding in a replacement. We carry a range of common steel section sizes on the truck — RHS, SHS, and flat bar — so most standard-sized gates can be repaired the same day without ordering materials.
5. Failed Lock-Rail or Latch Points
The section of the gate frame around the latch or lock mechanism takes repeated lateral force every time the gate is opened or slammed. The weld at the lock rail-to-frame junction cracks, or the keeper plate on the post shears off its welds. The gate either won't latch or the lock mechanism has play in it.
The repair: re-weld the failed joint with a fillet weld rather than just the butt weld that typically fails. If the lock rail is badly distorted, we sometimes add a reinforcing gusset behind the latch point to distribute the load better.
Steel vs Aluminium Gate Repair
Steel gates are by far the most common in Sydney — mild steel painted or galvanised, or sometimes powder-coated. Aluminium gates are lighter and common in modern residential developments.
Steel repairs are straightforward MIG or stick welding. Cold galv spray or zinc primer seals the weld area after repair to match the corrosion protection of the original gate.
Aluminium gate repairs require TIG welding with the correct 4043 or 5356 aluminium filler wire and an AC/DC TIG machine. The weld zone is more sensitive to contamination and heat management than steel. Aluminium repairs take longer and cost 20–30% more than equivalent steel repairs. For more on aluminium vs steel welding properties, see our material comparison guide.
What Can Be Fixed On-Site vs Needs Replacement
Fix on-site: isolated hinge failures, single corner cracks, localised rust patches, bent sections where we can cut and splice, lock rail failures. The vast majority of gate repairs we do are on-site with the gate remaining in its opening.
Better to replace: gates with extensive rust corrosion across multiple members (the steel is below structural thickness throughout), gates where the frame has twisted significantly out of square (straightening to within tolerance is difficult on site), gates more than 15–20 years old where multiple failures suggest the overall frame has reached end of life.
When we inspect a gate before quoting a repair, we check the frame square (diagonal measurement), the remaining wall thickness in the tubes, and whether the hinge posts are still plumb. If two of those three are significantly out, replacement is usually the honest recommendation.
Gate Repair Cost Guide — Sydney 2026
- Hinge plate re-weld (single): $180–$280
- Hinge plate replacement (new plate welded in): $240–$380
- Frame corner crack repair: $220–$350
- Rust patch (cut and weld): $280–$450 per section
- Bent section cut-and-splice repair: $320–$500
- Lock rail or latch point repair: $180–$300
- Full hinge upgrade (heavy gate): $450–$700 (both hinges, new heavy-duty plates, gussets)
- Aluminium gate repairs: add 20–30% to above
All prices include the call-out fee for jobs within Sydney metro. Materials (replacement tube sections, plates, hinges) are additional and quoted separately.
When to Repair vs Replace
Repair if: the damage is isolated, the frame is still structurally sound, the gate is less than 15 years old, and the repair cost is less than 40–50% of a new gate supply-and-install.
Replace if: rust is widespread through the frame, the gate has been repaired 3+ times already, the frame is significantly out of square, or you want to upgrade to an automated system that requires a different gate weight and configuration.
We'll give you an honest assessment at the inspection stage. There's no benefit to us recommending a repair that'll fail again in 12 months.
For urgent gate failures — overnight security issues or safety concerns — see our emergency welding guide. For related repair services on handrails and fencing, see our handrail and balustrade guide.
See the gate repair service page or the full mobile welding service for Sydney coverage. Call 0426 829 762 or send photos to get a quote before we arrive.